This aquifer is quite interesting. Wharton wanted to tap into it and sell it to PA. It contains glacial water. However, this watershed feeds into almost all the lakes and rivers in the Pine Barrens. Wondering if this is where the higher levels of PH occur from? 17 trillion gallons is a lot of water and could sufficiently impact the ecosystem. Especially in regards to pollutants in the soil. Hmmmm.
Piney Water=True Piney Power?
I once read the statistic that the amount of water in the Kirkwood-Cohansey aquifer system is enough to cover the entire state of NJ in a lake 10 feet deep (!)
The containment of the water in the sandy substrate comes from the fact that there are layers of clay and rock with lower porosity below that contain it. The geologic history of the outer coastal plain is fascinating. The sand was deposited over layers of clay and sedimentary rock, over the course of time when the sea levels rose and fell, and the ancient Hudson River rode over NJ.
My understanding is that the water is acidic because of the tannic acid from cedars and the decaying organic matter. Tannins give the cedar water its brown color (same as the brown color of tea. Green tea leaves have not matured and therefore do not have the tannins, where black tea leaves do).
I also understand that there are no naturally occurring lakes in the pinelands, and the hydrology of the streams and swamps in the pinelands is unique, in that the streams are places where the water in the aquifer is exposed on the surface of the ground.
The iron content has to do with the oxidation or reduction (I believe that both happen) of iron found naturally in the soil. The acidity of the water leaches the iron, and when dissolved it undergoes bacterial action to either gain or lose an electron, and it becomes iron oxide (chemically the same as rust), where it is deposited on the sides of streams, etc. This is where bog iron comes from. If you go north to the geologic region that they call the Piedmont, you will find that some of the shale is black and some is red. The 'red-bed' shale occurs because of iron oxide and a similar process when exposed to air. The black was formed underwater.
I may be remembering this incorrectly, but I want to say that the greatest threat to the aquifer is not pollution (because of the cleaning capacity of the aquifer and the sheer volume of the water), but is instead the threat of salt water intrusion. Not to say that pollution from nonpoint sources and illegal dumping etc don't damage the aquifer, but I seem to remember that in the area around Atlantic City there is some concern because of drawdown of the aquifer.
We really have to send out the bat-signal for Spung-man to come on here and lay down the knowledge, he's the man with geology.